50uA current standard
Having come into possession of a relatively new (~2008) Simpson 260 series 8 VOM, I decided to make a 50uA current source to help measure this meter's full scale deflection, and calibrate the VOM if necessary.
In this video, I discuss my experience of making W2AEW Alan Wolke's circuit - he is a resource that I highly recommend for anything electronic and amateur radio related!
I include below links to the documents I refer to into my video and share my learning process in how this "Wilson Current Mirror" works.
"Zero-temperature coefficient reference diodes" - Microsemi Micronotes series 205 summer 1997:
https://www.microsemi.com/document-po...
Microsemi 1N4577 diode current/temperature charts:
https://www.microsemi.com/document-po....
W2AEW, Alan Wolke's excellent video on Simpson 260 calibration and the circuit I used:
• #324: How to "calibrate" the Simpson 260 V...